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Commit 49b6c01f authored by Kirill Tkhai's avatar Kirill Tkhai Committed by David S. Miller
Browse files

sparc64: Make itc_sync_lock raw 



One more place where we must not be able
to be preempted or to be interrupted in RT.

Always actually disable interrupts during
synchronization cycle.

Signed-off-by: default avatarKirill Tkhai <tkhai@yandex.ru>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aa3449ee

arch/sparc/kernel/smp_64.c

+3 −3
Original line number Diff line number Diff line
@@ -149,7 +149,7 @@ void cpu_panic(void) 
#define NUM_ROUNDS	64	/* magic value */

#define NUM_ITERS	5	/* likewise */



static DEFINE_SPINLOCK(itc_sync_lock);

static DEFINE_RAW_SPINLOCK(itc_sync_lock);

static unsigned long go[SLAVE + 1];



#define DEBUG_TICK_SYNC	0
@@ -257,7 +257,7 @@ static void smp_synchronize_one_tick(int cpu) 
	go[MASTER] = 0;

	membar_safe("#StoreLoad");



	spin_lock_irqsave(&itc_sync_lock, flags);

	raw_spin_lock_irqsave(&itc_sync_lock, flags);

	{

		for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {

			while (!go[MASTER])
@@ -268,7 +268,7 @@ static void smp_synchronize_one_tick(int cpu) 
			membar_safe("#StoreLoad");

		}

	}

	spin_unlock_irqrestore(&itc_sync_lock, flags);

	raw_spin_unlock_irqrestore(&itc_sync_lock, flags);

}



#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)